Implementing PCA/Whitening
From Ufldl
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We achieve this by computing the mean for each patch and subtracting it for each patch. In Matlab, we can do this by using | We achieve this by computing the mean for each patch and subtracting it for each patch. In Matlab, we can do this by using | ||
| - | avg = mean(x, 1); | + | avg = mean(x, 1); % Compute the mean pixel intensity value separately for each patch. |
x = x - repmat(avg, size(x, 1), 1); | x = x - repmat(avg, size(x, 1), 1); | ||
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xZCAwhite = U * diag(1./sqrt(diag(S) + epsilon)) * U' * x; | xZCAwhite = U * diag(1./sqrt(diag(S) + epsilon)) * U' * x; | ||
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| + | {{PCA}} | ||
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| + | {{Languages|实现主成分分析和白化|中文}} | ||
